हिंदी

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher. - Science

Advertisements
Advertisements

प्रश्न

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

लघु उत्तरीय

उत्तर

  • Yes, there can be displacement in an object in the absence of force. If the object is moving at a uniform speed, then no external force acts on that object, but there is displacement in the object.
  • When an object is released in a free state from an inclined plane, it comes down due to the force of gravity, but on reaching the earth's surface, no force acts on it in the horizontal direction.
  • That object moves at a uniform speed in the horizontal direction, and displacement keeps occurring in it.
shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 11: Work and Energy - Exercises [पृष्ठ १५८]

APPEARS IN

एनसीईआरटी Science [English] Class 9
अध्याय 11 Work and Energy
Exercises | Q 12 | पृष्ठ १५८

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.


When is work said to be done by a force?


Differentiate between energy and power.


A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)


A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


Fill in the blank with suitable word :
Work is measured as a product of __________ and __________


Fill in the blank with suitable word : 
The work done on a body moving in a circular path is __________


A uniform circular motion is an accelerated motion. Justify it.


What is the SI unit of work?


A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?


What are the quantities on which the work done depends?

Write the S.I. units of power.

Define energy and name its unit.

Fill in the boxe to show the corresponding energy transformation.


A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate:  the speed of the body.


State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.


The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one


Who is the odd one out?


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

An engine is pulling a train.


Work done by this force at any instant is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×